<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
        <!-- 添加角色按钮区域 -->
        <el-row>
            <el-col>
                <el-button type="primary">添加角色</el-button>
            </el-col>
        </el-row>

        <!-- 角色列表区域 -->
        <el-table :data="rolelist" border stripe>
            <!-- 展开列 -->
            <el-table-column type="expand">
                <template slot-scope="scope">
                    <el-row v-for="(item1, i1) in scope.row.children" :key="item1.id" :class="['bdbottom', i1 === 0 ? 'bdtop' : '' , 'vcenter']">
                        <!-- 渲染一级权限 -->
                        <el-col :span="5">
                            <el-tag closable @close="removeRightById(scope.row,item1.id)">{{item1.authName}}</el-tag>
                            <i class="el-icon-caret-right"></i>
                        </el-col>
                        <!-- 渲染二级和三级权限 -->
                        <el-col :span="19">
                            <el-row v-for="(item2, i2) in item1.children" :key="item2.id" :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']">
                                <el-col :span="6">
                                   <el-tag type="success" closable @close="removeRightById(scope.row,item2.id)">{{item2.authName}}</el-tag>
                                   <i class="el-icon-caret-right"></i>
                                </el-col>
                                <el-col :span="18">
                                    <el-tag type="warning" v-for="(item3,i3) in item2.children" :key="item3.id" closable @close="removeRightById(scope.row,item3.id)">{{item3.authName}}</el-tag>
                                </el-col>
                            </el-row>
                        </el-col>
                    </el-row>

                   <!-- <pre>
                        {{scope.row}}
                   </pre> -->
                </template>
            </el-table-column>
             <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="角色名称" prop="roleName"></el-table-column>
            <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
            <el-table-column label="操作" >
                <template slot-scope="scope">
                    <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                    <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                    <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
                </template>
            </el-table-column>
        </el-table>
    </el-card>

    <!-- 展示分配权限对话框 -->
    <el-dialog title="权限分配" :visible.sync="setRightDialogVisible" width="50%" @close="setRightDialogColsed">
        <!-- 树形控件 -->
        <el-tree :data="rightslist" :props="treeProps" show-checkbox node-key="id" default-expand-all  :default-checked-keys="defKeys" ref="treeRef"></el-tree>
        <span slot="footer" class="dialog-footer">
            <el-button @click="setRightDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="allotRights">确 定</el-button>
        </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
    data(){
        return {
            // 所有角色列表数据
            rolelist:[],
            // 控制分配权限对话框的显示与隐藏
            setRightDialogVisible:false,
            // 所有权限的数据
            rightslist:[],  
            // 树形控件的属性绑定事件 
            treeProps:{
                label:'authName',
                children:'children'
            } ,
            // 默认选中的节点id值数组
            defKeys:[],
            // 当前即将分配权限的角色id
            roleId:''   


        }        
    },
    created() {
        this.getRolesList()
    },
    methods:{
       // 获取所有角色列表
       async getRolesList(){
            const { data : res } = await this.$http.get('roles')
            if(res.meta.status !== 200) {
                return this.$message.error('获取角色列表失败！')
            }
            this.rolelist = res.data
            // console.log(this.rolelist);            
        },
        // 根据id删除对应的权限
         async removeRightById(role,rightId){
            //  弹框提示用户是否删除
            const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
            }).catch(err => err)

            if(confirmResult !=='confirm') {
                return this.$message.info('已取消删除')
            }

            const {data:res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`) 
            if(res.meta.status !== 200) {
                return this.$message.error('删除权限失败！')
            } 

            // this.getRolesList()   
            // 把服务器返回的最新的权限直接赋值给当前角色的children属性  防止整个列表的刷新
            role.children = res.data  
         },
        //  展示分配权限对话框
         async showSetRightDialog(role){
            this.roleId = role.id

            //  获取所有权限的数据
            const {data : res} = await this.$http.get('rights/tree')
            if(res.meta.status !== 200){
                return this.$message.error('获取权限信息失败！')
            }

            // 把获取到的数据保存到data 中
           this.rightslist= res.data
        //    console.log(this.rightslist);           

            // 递归获取三级节点的id
            this.getLeafKeys(role,this.defKeys)

             this.setRightDialogVisible=true
         }  ,
        //  通过递归的形式,获取角色下所有三级权限的id,并保存到 defKeys数组中
         getLeafKeys(node,arr){
             // 如果当前node 节点不包含children 属性,则是三级节点
             if(!node.children){
                 return arr.push(node.id)
             }

             node.children.forEach(item => this.getLeafKeys(item,arr))
         },
        //  监听分配权限对话框的关闭事件
         setRightDialogColsed(){
             this.defKeys=[]
         },
        //  点击角色分配权限
         async allotRights(){
             const keys=[
                 ...this.$refs.treeRef.getCheckedKeys(), // ... 展开运算符
                 ...this.$refs.treeRef.getHalfCheckedKeys(),

                 ]
                const idStr= keys.join(',')

                const {data:res} = await this.$http.post(`roles/${this.roleId}/rights`,{rids : idStr})

                if(res.meta.status !== 200){
                    return this.$message.error('分配权限失败!')
                }

                this.$message.success('分配权限成功!')
                this.getRolesList()  // 刷新角色列表
                this.setRightDialogVisible = false  // 关闭分配权限对话框
                 
         }
    }
}
</script>

<style lang="less" scoped>
.el-tag{
    margin: 7px;
}

.bdtop{
    border-top:1px solid #eee;
}
.bdbottom{
    border-bottom: 1px solid #eee;
}
.vcenter{
    display: flex;
    align-items: center;
}

</style>